Thermogravimetric Analysis on the Combustion Characteristics for Blended Coals

Yan, Xu; Lin, Sen; Yuan, Hongtao; Zhu, Kun; He, Xiuli; Chen, Gang

doi:10.1007/978-3-540-76694-0_28

Cited by 4 publications

(6 citation statements)

References 4 publications

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“…The Coats–Redfern integral method, which is one integral method for a single heating rate − , is used widely in analyzing the kinetic parameters of nonisothermal combustion processes and was adopted in the present investigation. According to the Coats–Redfern equation: if .25em n ≠ 1 , 2em ln | 1 − false( 1 − a false) false( 1 − n false) T 2 false( 1 − n false) | = ln .25em [ A R normalβ E ( 1 − 2 R T E ) ] − E R T if .25em n = 1 , 2em ln .25em | ln .25em false( 1 − a false) T 2 | = ln .25em [ A R normalβ E ( 1 − 2 R T E ) ] − E R T In order to obtain kinetic parameters, coal combustion is assumed to be a first-order reaction . Therefore, the data in Coats–Redfern kinetic analysis were obtained by taking the reaction order as unity.…”

Section: Resultsmentioning

confidence: 99%

“…For both temperature zones, the Coats–Redfern method above is used to obtain kinetic parameters, apparent activation energy E , and pre-exponential factor A . The mean activation energy ( E m ) proposed by Cumming is used to describe the reactivity or combustibility of blended coal combustion. , The method is shown as follows: E normalm = ∑ E i F i where E i is the activation energy of different stages, in kilojoules per kilogram, and F i is the mass loss fraction of the different stages, as a percentage.…”

Section: Resultsmentioning

confidence: 99%

“…In order to obtain kinetic parameters, coal combustion is assumed to be a first-order reaction. 33 Therefore, the data in CoatsÀ Redfern kinetic analysis were obtained by taking the reaction order as unity. The CoatsÀRedfern equation above is used to calculate the activation energy E and pre-exponential factor A.…”

Section: Interaction Effect Of Blended Coalmentioning

confidence: 99%

“…The mean activation energy (E m ) proposed by Cumming is used to describe the reactivity or combustibility of blended coal combustion. 33,37 The method is shown as follows:…”

Section: Interaction Effect Of Blended Coalmentioning

confidence: 99%

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A Study on Coal Properties and Combustion Characteristics of Blended Coals in Northwestern China

et al. 2011

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The utilization of blended coals has become popular in northwestern China. In this paper, investigations on coal properties and combustion characteristics of blended coals have been carried out to provide guidance for blended-coal-fired plants. Experimental results show that proximate, ultimate, and calorific value analyses of blended coals can be calculated by mass-weighted average of individual coals. However, grindability, ash composition, ash fusion temperatures, and some characteristics related to combustion performance of blended coals cannot be predicted accurately from those of individual coals and the mixture ratio. Blending a coal of high fusion temperatures with a coal of low fusion temperatures can significantly increase the ash fusion temperatures of blended coals. Thermogravimetric experimental results indicate that the intense combustion stage of blended coals is quite different from those of individual coals. Thermogravimetric curves of blended coals lie between those of individual coals but show nonadditive behavior. Furthermore, combustion characteristics of blended coals improve significantly with increased oxygen concentration, and combustion performance of low-reactivity coal is less sensitive to changes in oxygen concentration. Kinetic analysis indicates that the apparent activation energy of coal combustion is not constant at different conversion fractions. The combustion process of blended coals is charactered by segmentation and the apparent activation energy in low-temperature zone is higher than that in high-temperature zone. The mean activation energy of blended coals shows nonadditivity performance in both KissingerÀAkahiraÀSunose (KAS) and CoatsÀRedfern methods due to the interaction between individual coals. The KAS method is more adequate than the CoatsÀRedfern method for analyzing the kinetics of blended coal combustion because the CoatsÀRedfern method requires prior assumption of reaction mechanism and its analysis results sometimes differ clearly from experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Interaction Effect Of Blended Coalmentioning

confidence: 99%

“…The mean activation energy (E m ) proposed by Cumming is used to describe the reactivity or combustibility of blended coal combustion. 33,37 The method is shown as follows:…”

Section: Interaction Effect Of Blended Coalmentioning

confidence: 99%

See 2 more Smart Citations

A Study on Coal Properties and Combustion Characteristics of Blended Coals in Northwestern China

et al. 2011

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“…The index S includes the main characteristics of coal combustion from ignition through volatile matter and char combustion to burnout. It overall reflected the combustion characteristics of coal [9]. The relations of the index S with low pressure for the bituminous coal and lignite were shown in Figure 8.…”

Section: The Combustibility Index Smentioning

confidence: 88%

Study on the Combustion and Kinetic Characteristics of Pulverized Coal in Low-pressure Environment

Zhang¹,

Ba²,

Hu³

et al. 2017

dteees

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Combustion characteristics of two Chinese pulverized coals have been investigated using TG/DTG/DSC in the low-pressure environment. The changes of combustion characteristic parameters of pulverized coals under the different lowpressure environment are analyzed and the kinetic parameters of pulverized coals of each condition are calculated. In the low-pressure environment, a series of characteristic parameters such as ignition temperature, burnout temperature, the temperature corresponding to maximum burning rate, DTG max , combustion characteristics index S, the combustion characteristics of the experiments coal was researched. Also the thermal analysis kinetics (Coats-Redfern) method were investigated on the activation energy in three different absolute pressures (80kPa, 70kPa, 60kPa) to reveal the effects of the pressures on coal combustion. The results indicate that: when the pressure decreased, the T V , T m , T h increased, and simultaneously the activation energy (E) increased, the combustion characteristics became much bad, indicated that need more energy from external.

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Experimental study on interaction and kinetic characteristics during combustion of blended coals

Zhang

Liu

Wang

et al. 2011

J Therm Anal Calorim

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Thermogravimetric Analysis on the Combustion Characteristics for Blended Coals

Cited by 4 publications

References 4 publications

A Study on Coal Properties and Combustion Characteristics of Blended Coals in Northwestern China

A Study on Coal Properties and Combustion Characteristics of Blended Coals in Northwestern China

Study on the Combustion and Kinetic Characteristics of Pulverized Coal in Low-pressure Environment

Experimental study on interaction and kinetic characteristics during combustion of blended coals

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